AMEX Black Card (American Express’ Centurion) is nice. I am phasing out of Citi cards and moving to Chase as they have better rates and more perks.
The Black is cool from what I hear, but you have to use it a lot... more than $250,000 annually. WAAAAAAAAAAAY more than what an Average Joe charges to his card. The biggest purchase to date on an AmEx Black is a $30 million jet.